324 NEW YORK STATE MUSEUM 
doubtful whether the spine that now holds a horizontal position, is the termi- 
nal spine, pushed far back, or only a lateral spine in an accidental position. 
The fragment of a segment indicates by the strong rounding of the 
antelateral angles and the great length, that it might belong to an oper- 
culum, in which case the absence of a median transverse line would be 
remarkable; or to one of the first sternites. The crowding and the trans- 
versely elongate form of the scales in the anterior lateral region indicate that 
this part has been pushed together in posterior direction and the anterior 
margin isnot complete. It probably extended as far forward as the median 
portion of the segment. | 
Mr Walcott has sent with the two types a third fragment which has 
not been figured hitherto, but which beautifully shows the character of 
the scales [pl. 58, fig. 2]. 
All the fragments and the size of the sculpturing indicate that Echin- 
ognathus clevelandi was a form of large dimensions and robust 
structure. . 
Genus MEGALOGRAPTUS Miller 
Another eurypterid of the Lower Siluric is from the Richmond 
group of Ohio and was described by S. A. Miller [1874] as a graptolite 
under the name of Megalograptus welchi. When the junior 
author was engaged on the monograph of the Graptolites of New York, 
inquiry was made in regard to this curious fossil and the information 
obtained! through Drs Ulrich and Foerste that the species is based, 
as the figures at once suggest, on fragments of an eurypterid. Dr Foerste 
has been engaged for some time in an investigation of the Richmond 
faunas of the Ohio valley, and as he presumably had secured all the material 
available of this form, we have asked him to publish in this place that 
part of his manuscript referring to Megalograptus. To this request he has 
kindly acceded by sending the appended description. The photographs of 
Miller’s types are here reproduced on plate 58. 
1 See N. Y. State Mus. Mem. 11. 1908. p. 247. 
